Type-writing machine.



O. A. MARTINI.

TYPE WRITING MACHINE.

APPLIGATION FILED 00122, 1909.

I 48,145 Patented Feb. 1, 1910.

.otr'ro A. MARTINI, or

NEW YORK; N. Y, ASSIGNOR TO UNDER-WOOD TYPEWRITER COMPANY, OF NEW YORK,N. Y., A CQRPORATION OF NEW .ITERSIEW'v TYPE-WRITING MACHINE.

arenas .Sp eeifieetion of Letters Patent.

Patented Feb. 1t, Mid.

Application filed October 22, 1909. SeriahNo. 523,961.

useful Improvements in Type-\Vriting Machines, of which the followingisa specification.

This invention relates to the paper-restraining wings or plates usuallymounted.

upon the frame of a typewriting machine,

which hold the paper against the traveling platen at the printing line.After the lower edge of a sheet, card or envelop has passed. beyond theusual pressure rolls, it is held on the platen largely by means of saidrestraining plates or wings, which are usually .pressed yieldinglyagainst the platen, their upper edges lying immediately below theprmtlng line. By shifting the platen to upper case position under theabove circumstances, the lower edge of the paper is carried above thewings; and upon returning the platen to lower case position, the loweredge of the paper fouls the restraining wings and becomes displaced onthe platen, so that the succeeding line of writing is' printed askew.

My invention is designed to prevent this displacement of the paper, byproviding means for shifting the paper-restraining wings or )lates outof the return path of the paper be ore the platenis returned to lowercase position. r

I provide a shifter which, when thrown in one direction, crowds andlocks the paperrestraining plates away from the platen againstthe'tension of thei springs. A-reverse throw of the shifter permits thesprings to, return the pa per-restraini11g plates to normal positionagainst the platen.

In the accompanying drawings, Figure 1 is a-rear perspective View of oneembodiment of'my invention, in normal inactive position, applied to theUnderwood type of front strike writing machine. Fig. 2 is a similar viewshowing the invention in active position, tliewings' or plates beingthrown back from the platen. Fig. 3 is a top plan view. Fig. .4 is across sectional View showing the wings or plates thrown back from theplaten. Figs.- 5 and (3 are similar detail cross-sectional views showingthe two positions assumed by thewings or plates.

A framework 1 having a. type segment 2 thereon supports a rlbbonvibrator 3, and

a vertically shiftable platen 4. i Plates or wings 5 to hold the papersmoothly against the platen at the printing line, are hinged at I .6tot-he segment 2 onopposite sides of the ribbon vibrator 3. Springs 7press the plates against the platen "4C. The rearward DOVE: ment of theplates 5 are limited by fingers 8, The shifting of the platen 4 from thelower use POSl'ElOll indicated in Fig. 5'to the upper case position,indicated in Fig. '6, when the lower, edge of'the sheet!) is engaged bythe plates 5, will carry such lower edge above, the upper edges of theplates or wings -5, as shown in Fig. 6." i

To shift the restraining plates or wings 5 away from the platen to avoidfouling the work 9 when the platen is returned to lower case position,shown in Fig. 5, I provide a shifter 10 having cams 11 thereon forengagement with the plates 5, and guidedby cars 14 formed on a bracket15. The shifter 10 may have the form of a slide having rammed orinclined edges 11, to engage the fingers S on the plates 5, the slide 10terminating at opposite ends in finger pieces 12, one at each side ofthe machine, for convenience in thrusting it in either direction.

Movement of the slide 10 in one direction draws the cam faces 11 beneaththe fingers 8 vto raise the latter and swing and lock the wings 5forwardly away from theplaten 4. Movement of the slide 10 in-theopposite direction permits spring 7 to return the plates 5 tothe platent. to hold the paper-9 firmly against the same. The movemdnts of theshifter may be lim itcd, as by shoulders or jogs 13 thereon engaging thefingers 8. The cams may be l'ormed by cutting away the shifter bar-becase position.

2. In a typewriting machine, the combination with a shiftable platenand. a movable plate for retaining the paper against the platen; of ashifter having a cam face for engagement with the plate to shift thelatter away from the platen to prevent the displacement of the paper byits engagement with the plate when the platen is'shifted to lower caseposition.

In a typewriting machine, the combination with a shiftable platen and amovable plate for retaining the paper against the platen, of a shifterhaving a cam face for wiping against a finger on the plate, to force ithe plate away from the platen, and a stop for arresting the throw ofthe shifter.

4. In a typewriting machine, the eomhination with a platen and a])l"Otlll V supported I wing spring-actuated toward the platen, of ashifter having a cam for engagement with a finger on the win to shiftthe latter away from the platen an prevent the engagement of the paperwith such wing when the platen is returned to lower case position.

5. In a typewriting machine, the combination witha shiftahle platen, anda movable plate mounted on the machine for pressing the paper againstthe platen along the printing line, of means for shifting the plate awayfrom the platen to prevent the engage-

